AcellusPerform the following operationand express the answer inscientific notation.7.15x103 x 6.10x10-5[ ? ]x10!??Coefficient (green)Exponent (yellow)Enter

In a covalent bond, one pair of electrons, two and three can be shared. Forming single, double, or triple bonds. The more electron pairs are shared, the stronger the bond will be.

According to these options presented here, we can see that:

Kelvin is for temperature

Milliliters are for volume

Seconds is for time

So, the answer for mass is grams (g). Therefore, we measure the mass in grams.

Answer: grams (g)

Answer:

Phosphate ion only

Explanation:

Here, we want to get the polyatomic ions with a charge of -3

What we have to do here is to write the polyatomic ions and their formula

We have this as follows:

From the above, the polyatomic ions with a charge of -3 is the Phosphate ion only

The timing of the tide is predictable by the moon's orbit around the earth is predictable

Tides are the periodic rise and fall of surface water caused by the gravitational force of the moon and sun, as well as the rotation of the earth. The movements of the solar system that influence the tides are predictable, so changes in tide height and time are predictable.

Tides can be predicted accurately and far in advance. Tides are caused by the orbital relationships between the Earth, the Moon, and the Sun. These relationships are well understood, and the positions of the celestial bodies can be predicted very accurately in the future.

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Physical changes are changes in which there are no changes in the internal structure of substances. When there is a chemical change a chemical reaction is involved and the internal structure of the substance changes.

Of the four options that give us the first two: The oxidation of steel and burned paper represents an oxidation and combustion reaction respectively, so they correspond to chemical changes.

The second two options are phase changes, there is no chemical reaction and therefore the internal structure of the substances does not change. So the options to select will be:

Answer:

Acetone evaporating

Ice melting

A) To find the number of moles of a compound, we can use the Molarity formula, which tells us that molarity is equal to the number of moles divided by the volume in liters.

M = n/V

Now in our question we have a few informations, the molarity and the volume

0.135M = n/0.04L

Therefore the number of moles will be:

n = 0.135M * 0.04L

n = 0.0054 moles or 5.4 * 10^-3 moles

B) Using the same molarity equation as it was used in letter A, we can find the number of moles:

M = n/V

0.0203M = n/0.00928

n = 0.000188 moles or 1.88 * 10^-4

C) Since the ratio of this reaction HCl + NaOH is 1:1, which means I need 1 mol of HCl to react with 1 mol of NaOH, we can easily find the excess by subtracting both numbers of moles:

Moles of HCl - Moles of HCl that reacted

0.0054 - 0.00018 = 0.0052 of excess of HCl or 5.2 * 10^-3

HCl + NaOH -> NaCl + H2O

The mid-ocean ridge would be the longest and largest mountainous region. With a circumference of 40,389 miles, it genuinely is a world landmark.

The water covers around 90% of the mid-ocean ridge system. The world is crisscrossed by a system of mountains as well as valleys that resembles the seams in a baseball. Tectonic plate movement on Earth is what creates it.

Mountain ranges like the Rockies had also often grown and fallen over the evolution of our planet. Whenever two continents clash, mountains are created. Due to their identical weight as well as diameter, neither plate would bury beneath the other.

In a process known as plate tectonics, sections of such Earth's mantle, known as plates, collide with one another as well as buckle up like such a rear bumper in a frontal collision to build the world's largest mountain ranges.

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In this question, we have a situation where all 3 known gas laws are being used in what is called the Combined gas law, and the formula for this law is:

P1V1/T1 = P2V2/T2

We have:

P1 = 100 kPa, or 0.987 atm

V1 = 2.50 Lites

T1 = 303 K

P2 = 90 kPa, or 0.888 atm

V2 = 3.75 L

T2 = ?

Now we add these values into the formula:

0.987 * 2.50/303 = 0.888 * 3.75/T2

2.47/303 = 3.33/T2

0.00815 = 3.33/T2

T2 = 408 K is the new temperature

Answer

Volume = 36669.3 L

Explanation

Given:

Mass of krypton = 22 g

Pressure = 140 mTorr = 0.14 Torr

Temperature = 40°C = 313 K

Required: Volume

We know:

Molar mass of krypton = 83,798 g/mol

R constant in torr = 62.363577 L.Torr/K/mol

Solution:

Step 1: Find the number of moles of krypton

n = m/M where n is the number of moles, m is the mass and M is the molar mass

n = 22 g/83,798g/mol

n = 0.263 mol

Step 2: Find the volume using the ideal gas law

PV = nRT

V = nRT/P

V = (0.263 mol x 62.363577 L.Torr/K/mol x 313 K)/0.14 torr

V = 36669.3 L

Answer

578.66 mol

Explanation

Given:

Volume, V = 5.6 L

Temperature, T = 18° C = 18 + 273 = 291 K

Pressure, P = 250 kPa = 250000 Pa

Using the ideal gas equation, we can solve for the number of moles:

Put the given values into the ideal gas equation to get the number of moles:

In this case, we have a two carbon molecule, the prefix for this type of molecule is Et

Since this compound has a double bond, the suffix will be ene

Therefore we have in this question, the molecule Ethene, letter D

Answer:

Explanation:

Here, we want to calculate the concentration of the gas in ppm

What we have to do here is to divide the number of molecules of the gas by the total number of molecules in the atmosphere, after which we can convert it to ppm

Mathematically, we have that as:

Now, we have to convert to ppm

To convert to ppm, we simply have to multiply the given ratio by 1,000,000

We have this as:

Answer:

A hockey puck is given an initial speed of 5.3 m/s . If the coefficient of kinetic friction between the puck and the ice is 0.05, how far does the puck slide before coming to rest? Solve this problem using conservation of energy.

Explanation:

This is easy to do and it is very cool how it works.

Force here is what converts the kinetic energy to heat by friction and slows the puck

fu  = coefficient of Kinetic friction

g = is the acceleration of gravity

Fu*g = a.

So friction force on the puck is the acceleration of gravity times the coefficient of kinetic friction and the acceleration force is made negative here because it is slowing down the puck. .

Puck friction to negative acceleration

fu=0.05

g = -9.81m/s^2

so

a = 0.05 * -9.81m/s^2 = -0.4905 m/s^2

For the moving puck

Velocity = v = u + (a*t) | u=initial velocity

So

Time = t = (v-u)/a

Distance = d = t *(v + u)/2

So

Distance d= ((v-u)/a) * ((v+u)/2)

This becomes d = (v-u)(v+u)/2a

Plugging in the numbers

d= (0 - 5.3)(0 + 5.3)/(2*-0.49.5) =28.63 meters

In this stoichiometry question, we have the following reaction:

4 Al + 3 N2 -> 2 Al2N3

We have:

2.5 grams of N2

We want to know how much Al we need in order to react with 2.5 grams of N2, and in order to do that, we need to find out how many moles of N2 we have in 2.5 grams, we will be using its molar mass, 28g/mol to do it:

28g = 1 mol

2.5g = x moles

28x = 2.5

x = 2.5/28

x = 0.089 moles of N2 in 2.5 grams

Now according to the molar ratio, we have 4 moles of Al for every 3 moles of N2, therefore, if we have 0.089 moles of N2:

4 Al = 3 N2

x Al = 0.089 N2

x = 0.119 moles of Al

Now we can find the mass needed, using the number of moles, 0.119 moles, and also the molar mass, 27g/mol:

27g = 1 mol

x grams = 0.119 moles of Al

x = 3.2 grams of Al is required

Answer is 3.2 grams

The concentration of CaCl₂ is 75 % W/V. This means 75 g of the solute in 100 ml solution. Therefore, mass of calcium chloride required in 230 ml of this solution is 172.5 g.

Mass by volume percentage of a solute is term used to represent the concentration of the solution.  % W/V  of a solution is the mass of solute in grams per 100 ml of the solution.

It is given that the mass by volume percentage of the calcium chloride solution is 75% (w/v). Thus 75 g of calcium chloride is present in 100 ml of the solution.

Therefore, the mass of calcium chloride in 230 ml of this solution is calculated as follows:

mass of solute =  (230 ml  ×75 g) /100 ml

                         =  172.5 g

Hence, the mass of calcium chloride is 172.5 g.

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The flow rate of the IV pump should be 17.06mL/hr.

1st) We need to calculate the patient's weight knowing that 1 lb is equal to 0.45 kg:

The patient weighs 106.65 kg.

2nd) If the patient needs a drip at 8.0 units per kg of body weight, we have to calculate the units for the patient:

So, the patient needs 853.2 units per hour.

3rd) To calculate the flow rate of the IV pump, we need to know the mL equivalent to 853.2 units:

So, the flow rate of the IV pump should be 17.06mL/hr.

In order to solve this question, we will be using the Gay-Lussac's gas Law, which is an experimental gas law that shows the relationship between temperature and pressure for a gas, the formula is:

P1/T1 = P2/T2

We have:

P1 = 1.00 atm

T1 = 20.0°C, but we need it Kelvin, therefore, 293 K

P2 = ?

T2 = 30°C, or 303 K

Now we add these values into the formula:

1/293 = P2/303

P2 = 1.03 atm is the new pressure

To answer this question we have to use the rule of dilutions:

Where C1 and C2 are the initial and final concentrations and V1 and V2 are the initial and final volumes, respectively. In this case we have to find C2 and the other values are given:

It means that the answer is 0.052M.

We can always convert mass (g) to moles by using the molar mass of the substance, which can be found in the periodic table. In this case, we will use the molar mass of sodium (Na), which is 23g/mole, i.e., each 23g of sodium corresponds to 1 mole.

Since we want to find the mass of 1.8 moles of Na, we can set the following proportion:

So, by using 1.8 moles of Na, we are using 41.4 g of sodium (Na).

To balance an equation with the oxidation numbered method we must write the oxidation states of the elements that participate in the reaction.

Once we have the oxidation states we must identify how they change from reactants to products. Thus we identify which are oxidized and which are reduced. If its oxidation state increases it is because the element is oxidized, if it decreases it will have been reduced.

We see that the elements that change their oxidation state are silver, Ag and Oxygen. We have that:

Water boils when the vapor pressure is equal to the atmospheric pressure.

The atmospheric pressure is least at the top of the mountain.

In order to answer this question, we will need to Avogadro's number, which represents the number of atoms or molecules within 1 mol of a compound, this number is equal to 6.02*10^23 atoms or molecules, now we want to know how many molecules there are in 7.32 moles, we will do that by performing the following calculation:

1 mol = 6.02*10^23 molecules

7.32 moles = x molecules

x = 4.41*10^24 molecules

Explanation:

Given the following reaction.

NO (g) + 1/2 O₂ (g) <---> NO₂ (g)

We have to find the relationship between its Kc and Kp.

The Kp can be calculated from the Kc using the following expression.

Kp = Kc * (R*T)^(Δn)

Where Δn is the sum of the coefficients of the products minus the sum of the coefficients of the reactants. So Δn will be equal to:

Δn = Σ n of products - Σ n of reactants

Δn = 1 - (1 + 1/2)

Δn = -1/2

So we can say that:

Kp = Kc * (R*T)^(Δn)

Kp = Kc * (R*T)^(-1/2)

Kc = Kp * (R*T)^(1/2)

Answer: Kc = Kp * (R*T)^(1/2)

Explanation:

When using public transport vehicles instead of private cars, we emit less pollution. For example in a bus more than 20 people travel, so the pollution per person is lower.

When we increase speed we usually consume more fuel, so avoiding accelerating rapidly we also reduce pollution.

Answer:

a) public transport vehicles.

b) accelerating rapidly.

5a) Propyne is a member of the alkyne group with the formula C3H4. The compound consists of 3 carbon atoms and 4 hydrogen atoms. The expanded form of the compound is as shown below;

b) For the skeletal structure of 2, 2 - dimethyl butane, the carbon and hydrogen atoms are hidden. The structure will only be written in form of lines as shown:

c) The molecular formula for benzene is C6H6. It is cyclic in nature with a total of 6 carbon atoms and 6 hydrogen atoms. The structure of the atom is as shown below;

d) Heptane is an alkane compound with the molecular formula C7H16. The condensed formula do not contain any lines or angles. They are written in term of their hydrogen and carbon compounds.

a) To get the number of moles of CO2 that are produced for each mole of C3H8 used, we will use the stochiometry ratio from the balanced chemical reaction.

The balanced chemical reaction that resulted from the combustion of propane gas is given as:

From the balanced reaction, you can see based on stoichiometry that for each mole of propane that reacted, 3 moles of CO2 was produced.

b) If you start with 362 grams of C3H8, the number of moles of propane will be expressed according to the formula:

Given the following parameters:

Mass of propane gas = 362 grams

Molar mass of propane = (3*12) + (1*8) = 36 + 8 = 44g/mol

From stoichiometry, you can see that 1 mole of C3H8 produces 4 moles of H2O, hence the moles of H2O that will be produced is given as:

Get the mass of H2O that was produced using the formula:

Therefore if you start with 362 grams of C3H8, 592.38grams of H2O will be produced

Identify Bo compounds as the quantitatively by the green coloration

The presence of boron compound can be detected quantitatively by green coloration they impart to the flame of an ordinary laboratory or bunsen burner and also boron can be identified by using spectrophotometric and colorimetric method and the chemical properties of boron are more similar to carbon and silicon than element of its own group although boron is the more electron dificient

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To answer this question, we have to use calcium oxide molar mass. It is 56.1g/mol, which means that 1 mol of this compound is 56.1 grams. Use this to find how many moles are there in 5.45grams of calcium oxide:

It means that for this mass, there are 0.097 moles of CaO.

The equilibrium constant Keq is the ratio of product of concentration of products in a reaction to that reactants. In the given reaction the equilibrium constant is 1.05 × 10²⁴.

The equilibrium constant in a reaction is the ratio of product of molar concentrations of products to the product of molar concentration of the reactants in the reaction.

In the given reaction, the product is PCl₅ and reactants are Cl₂ and PCl₃. Thus the expression for Keq is written as:

[tex]Keq = \frac{[PCl_{5}]}{[PCl_{3}][Cl_{2}]}[/tex]

Apply the number of moles and volume of all the reactants and products in this expression.

Keq = (2.01 × 10²¹molecules /1 L ) [(0.12/1L) (0.15/ 1L)]

      = 1.05 × 10²⁴

Hence, the equilibrium constant Keq is 1.05 × 10²⁴.

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Answer:

Lifting, instability, and moist/humid air

Explanation:

The water is released from the air, forming storm clouds, while humid air is flowing upward at a zone of low pressure over warm ocean water. The air in a hurricane rotates as it rises.